phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7247ba3a976ad1919d889dbe6134a246', -1, 1711719746, 1711719746, '2cc14dc4', -7, 0, 0)

Line : 187
File : sessions.php